java.lang.IllegalStateException: signature reserve byte range has been changed after addSignature(), please set the byte range that existed after addSignature()
at org.apache.pdfbox.pdmodel.PDDocument.saveIncrementalForExternalSigning(PDDocument.java:1361)
at org.apache.pdfbox.examples.signature.CreateVisibleSignature.signPDF(CreateVisibleSignature.java:270)